The effect of knowledge of object distance on accommodation during instrument viewing.

Abstract:

:We present data in which instrument accommodation was measured while knowledge of object distance was varied. The accommodative feedback loop was 'semiopen'--an intermediate state between the closed-loop and open-loop conditions of previous experiments. The semiopen-loop situation mimicked the degraded-image conditions which are frequently encountered during instrument viewing. The results show that for some subjects knowledge of object distance is a more powerful cue for instrument accommodation than is the optical distance of the object; however, for the majority of subjects this is not the case. We also found that subjects whose accommodation is influenced by knowledge of object distance tend to have a more proximal dark focus than those whose accommodation is independent of knowledge of object distance. We propose that the Mandelbaum effect, in which involuntary accommodation occurs when a transparency is superimposed between the observer and the object of regard, could account for the accommodative behavior of all subjects. However, the Mandelbaum effect would have to be interpreted more broadly than before. In the broader interpretation, the transparency could be cognitive (ie known distance) rather than physical.

journal_name

Perception

journal_title

Perception

authors

Kotulak JC,Morse SE,Wiley RW

doi

10.1068/p230671

subject

Has Abstract

pub_date

1994-01-01 00:00:00

pages

671-9

issue

6

eissn

0301-0066

issn

1468-4233

journal_volume

23

pub_type

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